Title:
OVERSHOT OF WIRE LINE SAMPLER
Document Type and Number:
Japanese Patent JP3765091
Kind Code:
B2
Abstract:
PROBLEM TO BE SOLVED: To provide an overshot for use with a wire line sampler which is easy to unlatch, when drilling the ground with a boring machine and sampling a sample core.
SOLUTION: A main shaft 44 resiliently energized via a cylinder body 43 and a compression coil spring 45 is placed within the first end of the latch-out ring 41 of an overshot 40. The first end of a latch case 42 is fitted into the end of the latch-out ring 41 and connected thereto by a spring pin 43a. When the main shaft 44 connected via an eye bolt 2 to a wire from above the ground is pulled to resist the compression coil spring 45, oil in a first oil chamber 1a flows into a second oil chamber 2a, moving the latch-out ring 41 to the right relative to the latch case 42, with the result that the left outer end of a latch 42a is pressed inward by a taper surface 41b to release a claw 42c.
Inventors:
Tetsuya Endo
Takeshi Banri
Uto Gioki
Takeshi Banri
Uto Gioki
Application Number:
JP24117696A
Publication Date:
April 12, 2006
Filing Date:
August 23, 1996
Export Citation:
Assignee:
Mining Industry Co., Ltd.
International Classes:
E21B25/00; E21B25/02; E02D1/04; (IPC1-7): E21B25/02; E02D1/04
Domestic Patent References:
| JP7247783A | ||||
| JP7011860A | ||||
| JP5263582A |
Attorney, Agent or Firm:
Eiichi Saito
Masami Hattori
Masami Hattori